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Users who run `configure' expect a certain style of output as tests are performed. As such, you should use the well-defined interface to the existing Autoconf macros for generating output. Your tests should not arbitrarily echo messages to the standard output.
Autoconf provides the following macros to output the messages for you in a consistent way (see section 3. How to run configure and make). They are introduced here with a brief description of their purpose and are documented in more detail in D. Autoconf Macro Reference. Typically, a test starts by invoking